Recent advances in analytical chemistry are characterized by great progress toward more powerful methods of separation, equaling in significance the great forward strides made in instrument methods of determination. Problems of chemical analysis almost always involve two steps; separation of the desired constituent and measurement of the amount or concentration of this constituent. Much worthy research has been dedicated to the development of more discrimination methods of estimation, such as spectrographic, spectrophotometric, and polarographicmethods, whichminimize the need for separation steps preceding themeasurement step. However, with the rapid growth of chemical technology, the analytical chemist is called upon to deal with mixtures of increasing complexity. Therefore to meet this challenge, powerful separation technique like solvent extraction or solvent extraction based methods are needed which enjoys a favored position among the separation techniques because of its ease, simplicity, speed, and wide scope.

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